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Question
Pick up the correct statement from the following:
Options:
A .  If two equal and perfectly elastic smooth spheres impinge directly, they interchange their velocities
B .  If a sphere impinges directly on an equal sphere which is at rest, then a fraction ½(1 - e2) the original kinetic energy is lost by the impact
C .  If two equal spheres which are perfectly elastic impinge at right angles, their direction after impact will still be at right angles
D .  All the above
Answer: Option D

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